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With the introduction of a variable time slice that scales down in function of the amount of waiting tasks, the scheduler is able to handle a steady stream of newly spawned tasks, without having to de-prioritize them to guarantee a good level of system responsiveness. Hence, the logic for de-prioritizing new tasks can be removed, as it currently doesn't provide any measurable benefits. In fact, it even proves counterproductive as it can implicitly slow down the interactive performance of shell sessions when the system is overloaded with a significant amount of CPU hogs (e.g, `stress-ng -c 128`). Signed-off-by: Andrea Righi <andrea.righi@canonical.com> |
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SCHED_EXT SCHEDULERS
Introduction
This directory contains the repo's schedulers.
Some of these schedulers are simply examples of different types of schedulers that can be built using sched_ext. They can be loaded and used to schedule on your system, but their primary purpose is to illustrate how various features of sched_ext can be used.
Other schedulers are actually performant, production-ready schedulers. That is, for the correct workload and with the correct tuning, they may be deployed in a production environment with acceptable or possibly even improved performance. Some of the examples could be improved to become production schedulers.
Please see the following README files for details on each of the various types of schedulers:
- rust describes all of the schedulers with rust user space components. All of these schedulers are production ready.
- c describes all of the schedulers with C user space components. All of these schedulers are production ready.
Note on syncing
Note that there is a sync-to-kernel.sh script in this directory. This is used to sync any changes to the specific schedulers with the Linux kernel tree. If you've made any changes to a scheduler in please use the script to synchronize with the sched_ext Linux kernel tree:
$ ./sync-to-kernel.sh /path/to/kernel/tree